linux-kernel - [PATCH 07/22] mm/vmstat: Drop get_online_cpus() from init_cpu_node_state/vmstat_cpu

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Message-Id: <20161126231350.10321-8-bigeasy@linutronix.de>
Date:   Sun, 27 Nov 2016 00:13:35 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     rt@...utronix.de, tglx@...utronix.de,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org
Subject: [PATCH 07/22] mm/vmstat: Drop get_online_cpus() from init_cpu_node_state/vmstat_cpu_dead()

Both functions are called with protection against cpu hotplug already so
*_online_cpus() could be dropped.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: linux-mm@...ck.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 mm/vmstat.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 604f26a4f696..0b63ffb5c407 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1722,24 +1722,19 @@ static void __init init_cpu_node_state(void)
 {
 	int cpu;
 
-	get_online_cpus();
 	for_each_online_cpu(cpu)
 		node_set_state(cpu_to_node(cpu), N_CPU);
-	put_online_cpus();
 }
 
 static void vmstat_cpu_dead(int node)
 {
 	int cpu;
 
-	get_online_cpus();
 	for_each_online_cpu(cpu)
 		if (cpu_to_node(cpu) == node)
-			goto end;
+			return;
 
 	node_clear_state(node, N_CPU);
-end:
-	put_online_cpus();
 }
 
 /*
-- 
2.10.2